Reheating-furnace.



J. DIETHER. REHEATING FURNACE. APPLICATION man JULY 2.1913.

1,1 83,353. Patented May 16, 1916.

Patented May 16, 1916.

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REHEATING FURNACE.

APPLICATION FILED IIILY 2, I9I3.

INGTQN. n. C.

` THE COLUMBIA pLANorInArn co.. WASH san aren i.

JOSEF DIETHER, 0F BRANDENBURCT-ON-THE-HAVEL, GERMANY.

i,is3,353.

Application filed July 2, 1913.

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof and in which:

Figure 1 is a longitudinal cross-sectional view of the furnace. Fig. 2 is partly a plan view of the furnace and partly a horizontal cross-sectional view taken on line A-'A of Fig. l. Fig. 3, left side, is a vertical sectional view on line D-D of Fig. l, right side, is a vertical sectional view `on line EE of Fig. l. Fig. l is a sectional view on line B-B of Fig. l. Fig. 5 is a sectional view on line C-C of Fig. l. Figs. 6, 7 and 8 are enlarged plan, sectional and plan views of the opening b and its complemental parts.

In the preferred embodimentA of my in-` vention, I provide a preliminary heating chamber a, provided with openings b in the side thereof, to enable the attendant to observe the mill bars c during their initial heating process and travel to the main hearth ci. Atmospheric air oxidizes the surfaces of the heated mill bars, and to vprevent the admission of atmospheric air into the heating chambers, a and d, and to keep the mill bars c from coming into contact therewith, I provide channels f adjacent the openings o through which the air, immediately on entering the heated chamber, is forcibly withdrawn into chamber g. Trap doors e provided with flaps h which serve to almost completely close channels f are provided for the openings o and said flaps it serve to prevent a too rapid withdrawal vof the combustion gases when the door e is closed, and before the gases have given up most of their heat to the mill bars. A door z' through which the mill bars are inserted into the furnace is provided, a plun- Speccation of Letters Patent.

REHEATING-FURNACE.

Patented May i6, i916.

serial No. 777,114.

ger y' provided with an enlarged end serves to slide the mill bars c into the chamber and upon rails 7c. A door t is provided in the opposite wall of the furnace and serves as an exit for the heated mill bars. Three reservoirs are provided above said heating chambers and communicating therewith, the intermediate reservoir containing gas and the remaining reservoirs containing heated air. A series of gas channels Z e (Fig. Ll) serve to inject their contents into the discharge channels, while heated air channels, formed at right angles to their complemental gas channels, inject their contents into said gas channels, thereby serving to more thoroughly mix the gas and air inthe main dischargel channels e, thereby eliminating all danger of having a too thin or heavy mixture of combustion gases. The channels 2- discharge the mixture into the preliminary and main heating chambers a and (Z respectively and indicated by the arrows in Fig, l.

`Flues 4a and a positioned adjacent the doors vl and t serve to withdraw waste heat from the heating chambers into the cham- `ber g. Slide valves m serve to control the amount of waste heat escaping through flues a and n. The channels g form a second combustion chamber, wherein the surplus gas contained in the waste heat is utilized to heat the floor o of the heating chambers a and (Z. Should the atmospheric air which under normal conditions enters the heating chamber and is drawn into the flues a and a be insufficient, additional ports j) must be provided having suitable valves and provided to admit an additional supply of combustion air.

The gas for heating the furnace is supplied from any suitable source and con* ducted by a pipe to the intermediate reservoir on top of the furnace, the admission being regulated by a valve within said reservoir. The combustion air after being preheated as will be described hereafter, is similarly conducted through a tubular conduit to the other (exterior) reservoirs and also regulated by valves. When entering the furnace through small channels Z-Z, the gas first meets the combustion air passing through the space m, m between the two walls and mixes with it before entering the combustion chambers .a--a After having heated the'mill bars the waste gases leave the heating chambers ca and d by channels or exhaust pipes n-J/z, and 71/ 71/ and partly also through channels f-f conducting them into channel g wherein their combustion is completed, if necessary, by the admission of supplementary hot air of combustion through the openings p-p from the furnace. From channel g the Waste gases are conducted by means of a flue g/-g/ through the alternating valve by the side of furnace S1 into regenerator r1, which they leave by passing the second valve at the side of furnace Sw for the chimney flue. In the meantime, the cold air enters through the valve No. l at the side of the furnace S as shown in Figs. l and 4 into the generator r which it leaves, preheated by Way of the valve No. 2 at the side of furnace Sm for the hot air channel from Where a tube conducts it to the top of the furnace. lVhen the generator r has cooled down so that it is necessary to reheat the same, both alternating valves 1 and 2 are reversed at once by which operation the Waste gases are obliged to pass through the regenerator 1' in order to reheat it, andthe cold air is conducted through the regenerator r1 to be preheated Within the same. This reversing operation is repeated as often as is necessary.

The Way which the mill bars take in the heating chambers of the furnace is clearly shown in the drawing. They are pushed by some machinery Which makes them travel on the rails through the preheating chamber a. At the other ends of the rails they fall upon the hearth of the heating chamber Z Where they are exposed for receiving the full heat and from Where they are Withdrawn through the port hole t.

I have herein described a preferred embodiment of my invention, but I do not limit myself to the exact description given and construction shown, as I may deviate therefrom Without departing from the spirit of my invention.

I claim:

l. A metal bar heating furnace, comprising in combination, heating chambers, a series of openings therein, combustion nozzles for said heating chambers, and exhaust flues adjacent said openings serving to WithdranT cold air entering said heating chambers thereby preventing oxidizaticn of the con` tents of said heating chambers.

2. In a metal bar heating furnace, in combination With heating chambers, of a series of openings therein, combustion nozzles for said heating chambers, exhaust flues adjacent said openings, serving to Withdraw cold air entering said heating chambers, thereby preventing oxidizing of the contents of said heating chambers, and valves secured to said openings to regulate the capacity of said openings.

3. In a metal heating furnace in combination with heating chambers, combustion nozzles for said chambers, of a series of openings therein, a floor heating chamber beneath said heating chambers and communicating With said openings Vand controllable hot air supply flues connected to said floor heating chamber combining to mix with the gas therein adapted to heat the floor of said heating chambers, substantially as described.

In testimony whereof I aliix my signature in presence of tWo Witnesses.

WOLDEMAR HAUPT, HENRY I-IAsrER.

Copies of this patentA may be obtained for ve cents each, by addressing the Commissioner of Patenti, Washington,` D. C." 

